Derek Washington

A Large-Area Electron Image Multiplier

Publisher Summary A widely used form of electron image multiplier is a glass-channel plate, which is created from a fused array of hollow fibers; however, in large sizes, it is both a difficult and a costly article to manufacture. It is concerned with a successful large-area multiplier, based on metal-dynode techniques, which overcomes the limitations of earlier designs. The chapter discusses both the design and construction of the multiplier and the evaluation of its properties as an electron image amplifier. It also describes the concept of the metal-dynode channel multiplier; a metal-dynode channel multiplier consists of perforate metal sheets (dynodes) that are insulated from each other and arranged in such a way that the individual holes are aligned to form channels through the structure. By setting up appropriate electric fields, electrons entering the channels are made to strike the dynodes and produce secondary electrons, which, in turn, are directed on to subsequent dynodes so that the secondary emission process is repeated at each stage through the multiplier. To enhance the gain, a region of high-secondary yield is created on each dynode surface. Spatial integrity of the electron image is also maintained by providing many channels in parallel.

The metal-dynode multiplier: a new component in CRT design

Abstract This paper describes a new component for use in CRTs — the metal dynode multiplier. The multiplier separates the addressing and power supplying functions of the electron beam. This offers exciting possibilities in CRT design including the relationzation of a tube having a 300 mm diagonal and depth of less than 75 mm.